Release Notes: This release adds a "simplified API" and removes some symbols which were deprecated in libpng15.
Release Notes: A major reorganization of the build system was undertaken. The png_ptr and png_info structs are now opaque, i.e., their members are not accessible to applications and have been moved into separate private header files. The pngvalid.c testing program was added.
Release Notes: A new "pngpriv.h" header is not visible to applications. The iTXt chunk is enabled by default. Decompressing compressed ancillary chunks (zTXt, iTXt, iCCP) is much faster.